package  chapter05.e8;
public class E8{
    public static void main(String[] args) {
        System.out.println("1、添加-------------------");
        add();
        System.out.println("2、删除-------------------");
        remove();
        System.out.println("3、修改-------------------");
        alter();
    }
    public static void add(){
        StringBuffer sb = new StringBuffer();//创建一个字符串缓冲区
        sb.append("itcast");//在末尾添加字符串
        System.out.println("append添加结果:" + sb);
        sb.insert(2,"123");
        System.out.println("insert添加结果:" + sb);
    }
    public static void remove{
        StringBuffer sb = new StringBuffer("itcastcn");
        sb.delete(1 , 5);
        System.out.println("删除指定位置结果:" + sb);
        sb.deleteCharAt(2);//指定位置删除
        System.out.println("删除指定位置结果:" + sb));
        sb.delete(0 , sb.length());//清空缓冲区
        System.out.println("清空缓冲区结果:" + sb );
    }
    public static void alter{
        StringBuffer sb = new StringBuffer("itcastcn");
        sb.setCharAt(1 , 'p');
        System.out.println("修改指定位置结果:" + sb);
        sb.replace(1 , 3,"qq");//替换指定位置字符串或字符
        System.out.println("替换指定位置字符(串)结果:" + sb));
        System.out.println("字符串反转结果:" + sb.reverse() );
    }
}
